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v3.19.3

Summary of Operations and Significant Accounting Policies - Warranty - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2019
Minimum |
Product Warranty [Line Items] |
Standard product warranty, period | 12 months
Maximum |
Product Warranty [Line Items] |
Standard product warranty, period | 24 months

X
- Definition Schedule of product warranty line items. + References No definition available. + Details
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Namespace Prefix: | asys_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Standard product warranty, period. + References No definition available. + Details
Name: | asys_StandardProductWarrantyPeriod
Namespace Prefix: | asys_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |